Sheave-block.



C. B. KING I C. B. WESTON.

SHE'AVE BLOCK.

APPLICATION FILED SEPT. I9. I9II.

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CHARLES B. KING AND CLARENCE B. WESTON, OF MARION, OHIO, ASSIG-NORS TOTHEl MARION STEAM SI-IOVEL COMPANY, OF MARION, OHIO, A CORPORATION OFOHIO.

SHEAVE-BLOCK.

Specification of Letters Patent.

Patented Aug.. 10, 1915.

Application filed September 19, 1911. Serial No. 650,207.

dipper type, although applicable to other..

uses.

The object of the invention is to Provide a sheave block which will beof a very strong, durable construction and will not be injured or thejoints thereof loosened by the hammering which it necessarily receiveswhen in service.

To this end it is a further object of the invention to provide a sheaveblock consisting of two cast metal side pieces which are rigidlyconnected one to the other and which support the sheave between them.

It is a further object of the invention to provide means for retainingthe cable in proper relation to the sheave and for spac-r .ing apart andreinforcing the side members;

and it is also an object of the invention to provide guards for thesheave which will prevent the same being injured or the cables beingtwisted or displaced when the sheave is drawn close to the point of theboom.

In the accompanying drawings, Figure 1 is a side elevation, partiallvbroken away, of thehpoint of a boom showing our improved sheave blockconnected therewith; Fig. 2 is a section, taken on the lline m a' ofFig. 1; Fig. 3 is a detail view of a portion ofthe sheave block showingthe same partially in elevation and partially in section; and Fig. 4 isan edge View of the lower portion of the block.

In these drawings we have illustrated one embodiment of our inventionand have shown the sheave block as comprising two side members 1, eachof which consists of but a single piece of metal and is preferablyformed by casting. These side members may be of any suitable shape andare here shown as comprising a. body portion substantially circular inshape and of a diameter slightly greater than the diameter of the sheavewhich is to be supported between thetwo side members. This sheave, which1s indicated at-2, is journaled on a shaft 3 which is mounted at itsends in the respective side members and preferably has its ends squaredto hold the same against rotation. The two side members of the block arespaced apart and rigidly connected one' to the other.

In the present instance each side member is provided on the lowerportion ythereof with two inwardly extending flanges 4, the flanges onthe two side members being arranged directly opposite one another andadapted to abut when the side members are connected one to the other.This connection is preferablv formed by means of bolts 5 which extendthrough the two side members and rigidly connect the same together. Inaddition to forming spaces to maintain the two side members of the blockin their proper relative positions, these inwardly extending angesconstitute cable guards and serve to prevent the cable from droppingaway from the sheave. The

upper portions of the side members are connected together by means of "abolt or pin 6 which extends through both of said members and is rigidlyconnected thereto. This bolt also constitutes the means by which thehoisting cable 7 is connected with the sheave block. To this end the pin6 -has mounted .thereon a clevis 8 to which the end of the cable isconnected. A. short sleeve 9 mounted on the pin 6 holds the cable nearone of the side members 1 for a purpose which will hereinafter appear.The thickness of the sheave is, in the present instance, somewhat lessthan the space between the inner walls of the side members of the block,and, to

prevent the cable from dropping between the sheave and the side memberseach mem-k stance, is the excavating dipper. As here shown this meanscomprises a p1n 11 mounted at its ends in the respective side members 1and having connected therewith a clevis 12 which, in turn, is connectedwith the bail of the dipper which is shown at 13 in Fig. 1.

The

When the sheave block is employed in connection with a boom and dipperexcavating machine it is supported from the outer end of the boom, whichis indicated at 14 in Figs. 1 and 2. To this end the point of the boomis provided with twin sheaves 15 mounted on a shaft 16 which, in turn,is mounted in bearing brackets carried by the outer ends or points ofthe two members constituting the boom.

In the operation of the mechanism the sheave block is not infrequentlydrawn up against the twin sheaves on the boom. This is liable not onlyto cause the disarrangement of the cables by twisting or otherwise butalso is liable to injure the sheaves. To prevent such injury we haveprovided each side member of the sheave block with a guard portion,which is here indicated by the reference numeral 17, and which extendssome distance beyond the adjacent portion of the sheave, and is adaptedto engage a part or parts carried by the boomto maintain the sheaveblock and the sheave in proper relations to the twin sheaves on the boomand to prevent the sheaves from coming in contact one' with the other.In the present construction the boom is provided with two guard wheels18 which are loosely mounted on the shaft 16 between the sheaves and therespective members of the boom and are adapted to be engaged by theguard pontions of the corresponding side members of the sheave block.-In order that the contact between these parts may be more certain theguard portions of the block are preferably provided with ianges 19 whichform wide contact surfaces. These flanges are, in the present instance,extendeddownwardly and across the body portions of the side members, asindicated at 20, and constitute reinforcing ribs which. add materiallyto the strength of the side members of the block. With this constructionwhen the sheave block is drawn close to theboom point the guard portionsof the sheaveblocks will engage the guard wheels on the boom and thesheave blocks will move about the axes of guard wheels until they reachthe limit of their movement. The clevis by. means of which the end ofthe cable is connected to the end of the sheave block being arrangedclose to one side of the sheave block and the sheave of the sheave blockbeing maintained in its proper relation to vthe sheaves on the boompoint, it will be obvious that there can be no twisting of the cable orany displacement thereof.

The boom points which support the shaft 16 are subjected to severestrain in the normal operation of the excavating mechanism, and, inorder to reinforce the ends of the wooden boom members and impart to thesame the necessary strength it has been customary to round ofi' thepoints of these members and bend either the top or bottom' guard plateabout this rounded portion of the boom. This construction involvesconsiderable labor and is, therefore, expensive and is open to otherobjections. In order to overcome these objections we have provided thepoints of the boom members with bearing blocks 21 of such a size andshape as to form continuations of the boom members. These bearing blocksare mounted between the armor plates 22 and the top and bottom plates 23and 24, and, when bolted in position, form a very strong durable supportfor the shaft 16 and the hoisting mechanism which is carried thereby.

The operation of the device has been fully explained in connection withthe description of the several parts thereof and it will be apparentthat we have provided a very strong and durable sheave block which issimple in its construction and can be manufactured at a relatively lowcost; that this sheave block is of such a character that it is notliable to injury by the severe hammering which it receives` when in use,this being' largely due tothe one-piece construction of the side membersthereof which eliminates all joints in these members. It will also beapparent that the block is of such a character that they cable will bemaintained in proper relation to the sheave; and further, that thesheave will not be injured nor the cable twisted when the sheave blockis drawn close to the boom.

While we have shown and described the several features of the inventionas embodied in a sheave block comprising two cast metalside members itwill be obvious that many of these features are applicable to built-upsheave blocks or to sheave blocks of constructions other than that hereshawn. e Further, we wish it to be understood that we do not desire tobe limited to the details of construction shown and described, forobvious modifications will occur to a person skilled in the art.

Having thus fully described our invention, what we claim as new anddesire to secure by Letters Patent, is:-

1. A sheave block comprising two side l' members and means to support asheave between said side members, each side member having reinforcementsextending vertically across the same and proj ecting below the bodyportion thereof to form a support fora work attaching device, eachmember also having inwardly extending flanges arranged along the loweredge thereof'on opposite sides of said reinforced portion, the flangesof the two side members being adapted to abut and serving both to spacethe side members apart and to form cable guards, and means to rigidlyconnect said side members one to the other with said flanges in theirabutting positions.

:r hilvingba projection arranged in ent with and adapted to engage theery of the respective guard wheels, a pported by said projections, acable Carried by said pin and arranged bethe projections, and a sleeveon the tween the olevis and one of the pro- `s to retain said clevisadjacent the of said projections. estimony whereof, we affix our signanpresence of two witnesses.

CHARLES B. KING. CLARENCE B. VESTON.

nesses: H. H. CONNOLLY, C. W. WRIGHT.

nig inwardly' extending airutfiiinges"of a diameter correspondingsubstantially to the diameter of said sheave and terminating adjacent tothe edge of said sheave.

el. A sheave block comprising side members spaced apart and rigidlyconnected one to the other, each of said side members having a guardextending substantially radially therefrom, said block having means toconneet a cable thereto at a point below the upper ends of said guards.

5. The combination, with a boom, a sheave Vrotatably supported thereon,and guard members mounted on the opposite sides of said sheave, of asheave block comprising side members having guard portions arranged inalinement with and adapted to membe alinem periph pin su clevis tweenpin be jection other 1 In t tures i Wit;

